SoundSpirit

Hello ucapps community, i am planing to build my own midi controler. I'm noob at electronics, but my father is electronics engineer so i think there will be no problems with building it, but i have few questions. Well i want to build midibox 64e based controler, something like this(maybe with 16 encoders) http://www.midibox.org/forum/index.php?topic=8875.0 and i want to know how much it will cost to build? Thanks in advance, SoundSpirit